At one point in the film, a sonar operator mentions a Soviet "Akula" class submarine. There are two different Soviet/Russian submarine classes referred to by that name: the Project 971 attack submarine known to the Russians as the Shchuka ("Pike") has the NATO code name Akula. The Project 941 missile submarine, NATO codename Typhoon, is named the "Akula" class in Russian. U.S. Navy personnel would usually use the NATO code-names, so the submarine under discussion, is an attack boat.

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